CN108366769A - Radioscopic image captures equipment - Google Patents

Radioscopic image captures equipment Download PDF

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Publication number
CN108366769A
CN108366769A CN201680072123.3A CN201680072123A CN108366769A CN 108366769 A CN108366769 A CN 108366769A CN 201680072123 A CN201680072123 A CN 201680072123A CN 108366769 A CN108366769 A CN 108366769A
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CN
China
Prior art keywords
ray
support member
rotary support
rotary
magnifying power
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Granted
Application number
CN201680072123.3A
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Chinese (zh)
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CN108366769B (en
Inventor
安柄俊
罗相沃
杨龙周
崔盛壹
洪大基
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Yiyou Technology Co Ltd
Vatech Co Ltd
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Yiyou Technology Co Ltd
Vatech Co Ltd
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Publication of CN108366769A publication Critical patent/CN108366769A/en
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    • A61B6/51—
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/027—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computerised tomographs
    • A61B6/032—Transmission computed tomography [CT]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/06—Diaphragms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4035—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/405—Source units specially adapted to modify characteristics of the beam during the data acquisition process
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/44—Constructional features of apparatus for radiation diagnosis
    • A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
    • A61B6/4435—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/44—Constructional features of apparatus for radiation diagnosis
    • A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
    • A61B6/4452—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being able to move relative to each other
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/46—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with special arrangements for interfacing with the operator or the patient
    • A61B6/467—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with special arrangements for interfacing with the operator or the patient characterised by special input means
    • A61B6/469—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with special arrangements for interfacing with the operator or the patient characterised by special input means for selecting a region of interest [ROI]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
    • A61B6/5258—Devices using data or image processing specially adapted for radiation diagnosis involving detection or reduction of artifacts or noise
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
    • G01N23/046—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using tomography, e.g. computed tomography [CT]

Abstract

A kind of radioscopic image capture equipment is disclosed, small width sensor is used, X ray CT image not only can be economically provided but also non-warping accurate X-ray panoramic picture is provided.Capturing equipment according to the radioscopic image of one aspect of the invention includes：The rotary support member rotated around rotary shaft；Generator Unit, be arranged the side of rotary support member and include X-ray irradiation beam X-ray producer；Sensor unit, opposite side in rotary support member is set with surface generator unit, object to be detected is positioned there between, and sensor unit includes small width sensor, and the small width sensor is moved along the width direction vertical with rotary shaft while rotary support member rotates；And control unit, during capturing sequence for obtaining multiple transmission image radioscopic images by the rotation of rotary support member, according to the change of distance between the target part of article to be inspected and small width sensor, change the rotary speed of rotary support member or the frame rate of sensor unit, to compensate the change of magnifying power.

Description

Radioscopic image captures equipment
Technical field
The present invention relates to x-ray imaging equipment.More particularly it relates to can be while using low dose X-ray The x-ray imaging equipment of CT images and panoramic picture is provided by using the sensor with narrow width.
Background technology
In medical field, X-ray radiography equipment refer to towards will by the X-ray of radiographic X body expo predetermined amount, The X-ray of body, and the electric signal sensed by using X ray sensor are had already passed through by using X ray sensor sensing Reconstruct radioscopic image.With the X-ray across body part to be decayed according to the ratio of the substance change in its travel path, And electric signal is changed by X ray sensor by photoelectricity.By using electric signal, X-ray radiography equipment provides X-ray The information of radiography target internal in image reflects the accumulation attenuation rate according to X-ray travel path in the electric signal.
In dental diagnosis field, CT images are widely used as tooth arrangement that is accurate and clearly illustrating patient, temporo jaw The CT images of the three-dimensional X-ray image of joint or head (these parts are the main target parts in body part), and according to The desired position and direction of user are used as faultage image.Thus, this image is used in the field for needing pinpoint accuracy, such as Implanted treatment.X ray computer fault imaging (CT) radiographic apparatus will be carried out radiographic X ray with various angles The radioscopic image of photograph target is rebuild, and provides the three-dimensional X-ray image of radiography target.For this purpose, X ray CT is penetrated (and main body is arranged on two to the X ray sensor that line camera installation includes X-ray producer, is set as in face of X-ray producer Between person), allow X-ray producer and X ray sensor to rotate the rotary support member supported simultaneously to it and be penetrated by using X The sensing result of line sensor and the image reconstruction unit for implementing CT images.
In order to obtain X ray CT image, X-ray producer and X ray sensor based on the rotation Jing Guo radiography target Shaft switch in predetermined angular region inward turning it is facing with each other, and with various angles obtain the visual field (i.e. FOV) X ray CT data. When executing common X ray CT radiography, the rotation of X-ray producer and X ray sensor based on the central axis as FOV Shaft rotates, and the X-ray of FOV whole regions is had already passed through with various angular acceptances.Thus, panoramic x-ray is imaged, greatly Size sensor is noticeably greater than required X ray sensor size.However, when the size of X ray sensor increases, manufacture Cost also increases, thus in dental X-ray imaging device fields, need small width sensor using big FOV to CT images into The radiographic X method of row, the big FOV are that twice of the width of small width sensor is big.
Meanwhile in dental field, X-ray panoramic picture has been widely used for a long time and has been considered as coming to diagnosing Say indispensable standard picture.Thus, in the radiographic apparatus for providing X ray CT image, usually to add The function of panoramic imagery.Herein, it is desirable to provide a kind of X-ray panoramic picture with high accuracy, because image is diagnosing Aspect is critically important.
Invention content
Technical problem
Thus, the present invention has been made that in view of the above-mentioned problems in the prior art, and the purpose of the present invention is carry It is economical by using small width sensor for a kind of x-ray imaging equipment, it occupies less for installing and penetrating The space of line photograph, provides the X ray CT image of relatively wide FOV, and effectively provides X non-distorted and with high accuracy Ray panoramic picture.
Technical solution
To achieve the goals above, include according to the x-ray imaging equipment of one aspect of the invention：It is rotated based on rotary shaft Rotary support member；Generate unit, be arranged the first side of rotary support member and include X-ray irradiation beam X-ray producer； The second side in rotary support member is arranged to face to generate unit in sensing unit, and between, and sensing unit includes main body Small width sensor, when rotary support member rotates, the small width sensor is moved along its width direction and perpendicular to rotary shaft 's；And controller, change when executing the x-ray imaging sequence for obtaining multiple transmission images by rotary support member rotates by allowing The rotary speed of rotary support member or the frame rate of sensing unit.
According to the change of distance between small width sensor and the target area of main body, controller can be by changing rotation branch The rotary speed of support member or the frame rate of sensing unit and the change of magnifying power is compensated.
Controller can the rotary speed of relative increase rotary support member or opposite reduction in the relatively large section of magnifying power The frame rate of sensing unit.
In the relatively large section of magnifying power, controller can keep the rotation speed constant of rotary support member, and subtract relatively The frame rate of small sensing unit.
X-ray imaging sequence can be panoramic imagery sequence, and arcuately track is distributed for the target area of main body.
Herein, compared with the section of the transmission image for obtaining nipper, the transmission image of tooth after for acquisition In section, the rotary speed of controller relative increase rotary support member or the opposite frame rate for reducing sensing unit.
In addition, equipment may further include image reconstruction unit, shifts at a predetermined interval and be overlapped multiple transmission plots Picture, with the magnifying power difference according to the position compensation on arching trajectory along horizontal axis, and according on arching trajectory along water The magnifying power along y direction is corrected in the position of flat axis direction by application ratio different from each other.
X-ray imaging equipment according to a further aspect of the invention includes：Rotary support member based on rotary shaft rotation；It generates Unit, be arranged the first side of rotary support member and include X-ray irradiation beam X-ray producer；Sensing unit, setting are being revolved Turn the second side of support element to face to generate unit, between, and sensing unit includes small width sensor to main body, is being revolved The small width sensor is moved along its width direction and perpendicular to rotary shaft when turning support element rotation；And controller, passing through When allowing rotary support member rotates and executing the x-ray imaging sequence for obtaining multiple transmission images, according to the target area of main body and The change of distance between small width sensor changes the rotary speed of rotary support member or the frame rate of sensing unit, with compensation The change of magnifying power, wherein X-ray producer are installed so that the direction of X-ray beam has relative to the table vertical with rotary shaft The predetermined inclination in face, and small width sensor is installed as tilting at a predetermined angle relative to the surface parallel with rotary shaft.
Herein, x-ray imaging sequence can be panoramic imagery sequence, and the target area of main body can arcuately track Distribution, and equipment may further include image reconstruction unit, be laid equal stress on by allowing multiple transmission images to shift at a predetermined interval It is folded, according to the position on arching trajectory, compensate the magnifying power difference along horizontal axis, and according on arching trajectory along level The magnifying power along y direction is corrected in the position of axis direction by application ratio different from each other.
Image reconstruction unit can be corrected due to top magnifying power caused by the inclination of small width sensor and lower part amplification The difference of rate.
Advantageous effect
X-ray imaging equipment constructed according to the invention is applied by using small width sensor and there can be economy Property, occupy it is less for install and radiographic X space, provide the X ray CT image of relatively wide FOV, and effectively provide X-ray panoramic picture non-distorted and with high accuracy.
Description of the drawings
Fig. 1 is showing the view of the construction of the radiography unit of x-ray imaging equipment according to the ... of the embodiment of the present invention.
Fig. 2 be showing assume by provided according to the construction of the radiography units of Fig. 1 embodiments have it is identical The view for the principle that in the case of the FOV of size, radiography unit rotating range reduces.
Fig. 3 is showing the view of the construction of x-ray imaging equipment according to the ... of the embodiment of the present invention.
Fig. 4 is showing by using the radiography unit of embodiment according to fig. 3 according to arching trajectory to panoramic picture Carry out radiographic X view.
Fig. 5 is the view for schematically showing the ideal relationship between arcuate shape and the panorama sketch being imaged to it.
Fig. 6 is distortion and its modification method for schematically showing the panorama sketch being imaged to the arcuate shape of Fig. 5 View.
Fig. 7 a are the views without the example for correcting panoramic picture that not application expands compensation.
Fig. 7 b are showing the example for the panoramic picture that the compensation of horizontal axis magnifying power is applied to radiography sequence View.
Fig. 7 c are the panoramas that the amendment of longitudinal axis magnifying power and tilt correction are applied to the radiography sequence of the image of Fig. 7 b The view of the example of image.
Specific implementation mode
Hereinafter, exemplary embodiment of the present invention will be described in detail with reference to the attached drawings.This is provided for purposes of illustration Literary the embodiment described, to provide the principle of the present invention completely.It will be understood by those skilled in the art that the present invention is not construed as It is restricted to these embodiments.In the accompanying drawings, identical reference numeral indicates same or like part.In reference numeral and ginseng Examine the component part described in another figure reference numeral it is identical when, the description of specific some component parts shown in figure will be saved Slightly.
Fig. 1 is showing the view of the construction of the radiography unit of x-ray imaging equipment according to the ... of the embodiment of the present invention.
X-ray imaging device configuration according to the present invention be include the radiography list for obtaining multiple X-ray transmission images Member, the controller of control radiography unit and rebuild X ray CT image and complete by using multiple X-ray transmission images The reconstruction unit of scape image.If necessary, radiography shell is may further include, to cover the outer of radiography unit Portion.The figure shows the construction of radiography unit.
Radiography unit 13 is included rotating driver 25 and is rotated by rotating driver 25 based on rotary shaft 25C Rotary support member 30, be arranged the first side of rotary support member 30 and include X-ray producer 321T and collimator 322 generation Unit 32 (so as to preset width radiation collimation X-ray beam) and the second side in rotary support member 30 is set to face to generate Unit 32 (main body is between) and include small width sensor sensing unit 31T, the small width sensor is along rotation branch The direction movement that support member 30 rotates.Preferably, small width sensor is moved along the tangential direction of rotational trajectory.
At 322 aspect of X-ray producer 321T and collimator, X-ray producer 321T and collimator 322 are installed as making , have relative to the surface vertical with the rotary shaft 25C of rotary support member 30 with the direction of illumination of X-ray beam shown in dotted line Predetermined inclination θB.Sensing unit 31T includes the small width sensor in face of X-ray producer 321T so that its light-receiving table Face tilts at a predetermined angle relative to the surface parallel with rotary shaft 25C.Herein, the direction of illumination of X-ray beam relative to Surface vertical rotary shaft 25C tilts upwards so that predetermined inclination θBMeet：0 degree<θB<90 degree.It is highly preferred that pre-determined tilt Spend θBSatisfiable condition is：0 degree<θB<45 degree.Thus, sensing unit 31T relative to the surface parallel with rotary shaft 25C to Under with corresponding and θBAngle tilt (surface is the peripheral surface of the imaginary circles cylindrical form based on rotary shaft 25C), make Obtain the angle, θ between the surface belonging to sensing unit 31T and rotary support member 30SMeet：90 degree<θS<180 degree.It is highly preferred that Angle, θSSatisfiable condition is：90 degree<θS<135 degree.For sensing unit 31T preferably, from laterally observed When, the direction of illumination relative to the X-ray beam originated from the focus X-ray F of X-ray producer 321T forms angle normal thereto.
The direction of illumination of X-ray beam tilts upward and sensing unit 31T is tilted down so that examinate can easily by His or her head is put into wherein, because the space in radiography unit is formed as cone, wherein bottom part is wider.
Meanwhile in the present embodiment, the shell for generating unit 32 is set perpendicularly to rotary support member 30, and X-ray is produced Raw device 321T is set as tilting wherein, but generates unit 32 and could be provided as being basically parallel to sensing unit 31T in itself.
Rotating driver 25 is supported by the upper interior section of radiography shell, and is installed as connecting at its drive shaft 253 It is connected to the rotary shaft 25C of rotary support member 30.In an example, rotating driver 25 may include directly driving (DD) motor, And it may be configured such that the center of the drive shaft 253 of DD motors is identical as the rotary shaft 25C of rotary support member 30.Herein, Can by using collecting ring (slip ring) by around drive shaft 253 power wiring or signal wiring connect, to prevent line Cable twisting.Collecting ring can be the wireless collecting ring without contact point.
Fig. 2 be show assume by provided according to the construction of the radiography units of Fig. 1 embodiments have it is identical The view for the principle that in the case of the FOV of size, radiography unit rotating range reduces.
Fig. 2 (a) shows that the direction of illumination of X-ray beam in normal conditions is parallel to the surface vertical with rotary shaft 25C, And thus sensing unit 31V is parallel to rotary shaft 25C, and Fig. 2 (b) shows the direction of illumination of X-ray beam according to the present invention It is tilted like that above with reference to described in Fig. 2 with sensing unit 31T.
Herein, the height H of FOV is identical as in Fig. 2 (a) and 2 (b).In Fig. 2 (b), X-ray beam oblique illumination, and Sensing unit 31T is installed to be inclination so that the focus X-ray F of X-ray beam is positioned close to rotary shaft 25C, than in Fig. 2 (a) Focus X-ray V it is opposite closer to.This means that the radius of turn of radiography unit can narrow, and the amount to narrow be focus X-ray F and The distance between XV.Thus, it can be reduced by the space that x-ray imaging equipment occupies, more specifically, ray as described above shines The size of phase shell can be reduced.
Meanwhile in Fig. 2 (a), if upper part and low portion symmetrically pass through from the point of view of the horizontal line of reference chart And slight error caused by aspherical main body and sensor can be ignored, then upper part of the magnifying power in sensing unit 31V With it is almost the same in low portion, the magnifying power is defined as the distance between focus X-ray V and sensing unit 31V of X-ray beam Distance between focus point XV and main body VH.In the figure, in addition to from sensor unit 31V, (sensor unit is based on horizontal line Symmetrical in upper part and low portion) and be not spherical form main body and come error condition outside, sensing unit The upper part of 31V and the magnifying power of low portion are essentially identical.However, in Fig. 2 (b), because of sensing unit 31T quilts It is set as tilting along the longitudinal axis of main body, so between the low portion and the low portion of sensing unit 31T of main body Distance is compared, the distance between the upper part of main body and the upper part of sensing unit 31T relatively closer to.In the figure, FS1=FS2And FH1>FH2, and thus magnifying power (the i.e. FS of the upper part image of main body1/FH1) it is relatively shorter than the lower part of main body Magnifying power (the i.e. FS of parts of images2/FH2).Thus, in the radiography unit 13 by using Fig. 1 to X-ray transmission image When carrying out radiography, for example, the image of the main body with square form is twisted as tapered in form.
Thus, when x-ray imaging equipment is rebuild and provides X-ray transmission image or panoramic picture, X according to the present invention Radiation imaging apparatus expands upper part and low portion by the gradient according to sensor, to correct difference.In weight When building unit and being rebuild by using the multiple transmission images obtained according to arching trajectory and provide panoramic picture, reconstruction unit is logical It crosses and multiple projection image shifts and overlapping is rebuild into main panoramic picture at a predetermined interval in the horizontal direction, and by main panorama Reflect upward direction and magnifying power difference in downward direction in image to provide the panoramic picture that distortion is corrected.
Fig. 3 is showing according to the ... of the embodiment of the present invention by being used in the radiography unit of x-ray imaging equipment Small width sensor provides the view of the construction of wide FOB.
The figure illustrates the constructions of radiography unit, and when executing radiography sequence, it is by allowing rotary support member 30 It rotates and small width sensor 311 is allowed to move and obtain multiple X-ray transmission images simultaneously, and this schematically shows from upper The rotary shaft 25C of rotary support member as described above 30 when side's observation.Radiography unit is controlled by being received from controller 60 Signal processed and execute x-ray imaging sequence.In dental X-ray imaging device, x-ray imaging sequence is divided into X-ray CT radiographies sequence and panoramic imagery sequence.Herein, X ray CT radiography sequence as an example is described first.
When executing X ray CT radiography sequence, rotated partly over the exposure pathways of the beam of main body X, Meanwhile virtual X-ray beam center movement so that X-ray beam is irradiated with various angles and in the range of scheduled or bigger Onto all parts.
Sensing unit 31 includes the narrow X ray sensor 311 in face of generating unit 32.In the FOV for the CT images to be obtained Total height and width be respectively t1 and w1 (highly refer to along the full-size for being parallel to rotary axis direction herein, width is Refer to along the full-size perpendicular to rotary axis direction) when, the height t2 of narrow X ray sensor is equal to or more than amplification degree * first Highly (t1) (t2 >=amplification degree * t1), and the width w2 of narrow X ray sensor is less than amplification degree * the first width w1/2 (w2<Expand Big rate * w1/2).In addition, narrow X ray sensor 311 is installed as the rotational trajectory (example along sensing unit 31 based on rotary shaft 25C Such as along the tangential direction of circular trace) movement, and generate the movement of unit 32 and narrow X ray sensor 311 direction in association 311 emitting x-ray XC of narrow X ray sensor.
In detail in this figure, concentric circles F, FA, F based on rotary shaft 25CBAnd FC is the fortune according to narrow X ray sensor 311 The widened FOV of dynamic range.For example, the original position indicated in solid line in narrow X ray sensor 311 is in stationary state and rotation When support element 30 is rotated with predetermined or bigger angle (such as 360 degree), the X ray CT image of minimum FOV F can be obtained.On It is substantially identical as conventional half beam (half beam) X ray CT radiographic apparatus to state situation.In addition, based on rotary shaft 25C is cut in narrow X ray sensor 311 from position shown in solid such as edge by additionally rotating during realizing continuous X-rays imaging When having moved the so big amount of its width to direction, that is, when moving to 311A, the radius of FOV FA presses narrow X ray sensor 311 Width expansion.Similarly, during continuous x ray is taken a picture, in twice that the amount that narrow X ray sensor 311 moves is its width When, or when the amount that narrow X ray sensor 311 moves is the three times of its width, FOV FBMotion range is also responded to FC Increase and expands.Thus, the width of narrow X ray sensor 311, which is less than, to be passed through practical widened FOV FA, FBWith the radius of FC The value for being multiplied by maximum amplification degree and obtaining.
As reference, for the convenience of description, in the foregoing description, based on rotary shaft 25C according to rotational time section sublevel The movement of the narrow X ray sensors of Duan Zhihang 311.Preferably, it can be executed while executing the rotation based on rotary shaft 25C narrow The movement of X ray sensor 311.Its description is will readily appreciate that by following description.
In terms of equipment construction, sensing unit 31 includes narrow X ray sensor driver 312, allows narrow X ray sensor 311 tangential direction along rotational trajectory in limited range moves.Narrow X ray sensor driver 312 is configurable to for example Drive shaft 314 with driving power caused by generating the motor 315 of driving power, transmitting and by narrow X ray sensor The connector 313 that 311 part is connect with drive shaft 314.However, this mechanical realization is merely exemplary and can be with each Kind form is implemented.
Meanwhile generate unit 32 with the position of narrow X ray sensor 311 movement assemble in association, be enough to cover The width X-ray irradiation beam XC of 311 width of narrow X ray sensor.As the structure example for it, generating unit 32 may include X-ray producer 321 and collimator 322, the X-ray producer is to cover the more wide of narrow X ray sensor motion range Degree sends out X-ray beam XT, and the collimator by the wider width adjustment X-ray beam XT and sends out X-ray with relatively narrow width Beam XC, the relatively narrow width cover the width of narrow X ray sensor 311 and are assembled according to the position of narrow X ray sensor 311.It is accurate Straight device 322 be configurable to can partly shield off at least one blade 323 of X-ray beam, for example generate allow it is at least one The motor 324 for the driving power that blade 323 moves, transmit caused by driving power drive shaft 325 and by blade 323 The connector 326 that a part is connect with drive shaft 325.Collimator 322 can drive a blade, the blade to have with pre- fixed width The slit of degree and by using a motor and the X-ray beam XC or described collimators through overconvergence can be by using independent The motor of setting drives at least two blades.
However, this construction of above-mentioned generation unit 32 is only exemplary, and can implement in a variety of manners.Example Such as, it generates unit 32 to be configurable to X-ray producer, the X-ray producer is to cover narrow X ray sensor 311 The narrow width of width sends out X-ray beam, and adjusts X-ray producer in association with the movement of the position of narrow X ray sensor 311 Direction of illumination, to send out the X-ray beam of convergence.It can obtain various other constructions.
Meanwhile controller 60 may further include according to the x-ray imaging equipment of embodiment as described above, the controller It is connected to and generates unit 32 and sensing unit 31, and control and generate unit 32 to send out and the position of narrow X ray sensor 311 fortune The dynamic X-ray beam XC assembled in association.Specifically, controller 60 for example may be coupled to narrow X ray sensor driver 312 And motor 315 is controlled, and include that narrow X-ray senses by using the control signal of narrow X ray sensor driver 312 or use The feedback signal of the location information of device 311 is controlled from the direction of X-ray beam for generating unit 32 and sending out.Control pair can be passed through Motor 324 that collimator 322 with reference to described in the embodiment of the figure is driven executes the control to X-ray beam direction.So And when implementing to generate unit 32 in the form of unlike those described above, thus it is possible to vary receive the detailed of the control signal of controller 60 Target.
The figure illustrates it is viewed from above when rotary shaft 25C, be not shown along X-ray producer 321 and sensing unit 31 Vertical direction inclination.However, being similar to sensing unit 31T and X-ray producer 321T as shown in Figure 1, sensing unit 31 and X-ray producer 321 could be provided as tilting relative to vertical rotary shaft 25C.Features described above in description later It is identical.
Fig. 4 is showing by using the radiography unit of embodiment according to fig. 3 according to arching trajectory to panoramic picture Carry out radiographic X view.
As shown, sensing unit 31E, 31F and 31G including small width sensor 311E, 311F and 311G are based on Rotary shaft 25C rotations, and the position of small width sensor 311E, 311F and 311G are moved along the tangential direction of rotational trajectory, i.e., It moves, and thus to obtain the effect for allowing rotary shaft to move in conventional X-ray photographic equipment, and is practically without along its width direction Rotary shaft 25C is allowed to move.Thus, X ray CT radiographic apparatus according to the present invention can provide X ray CT image and three-dimensional Image, and also X-ray panoramic picture is provided for the image layer of arcuately track DA distributions by using features described above.
Herein, because the rotary shaft 25C of radiography unit is fixed and arching trajectory DA has arrow or arc shape Formula, and non-circular form, so being obtained according to the position of small width sensor 11E, 311F and 311G shown in the figure saturating The distance between image (tooth DE, eyetooth DF or nipper DG after i.e.) and small width sensor 311E, 311F and 311G is penetrated to occur Change.X-ray producer 321E, 321F and 321G and small width sensor 311E, 311F and 311G at its position it Between distance it is identical, and thus occur magnifying power difference in the transmission image of acquisition.In the example of the figure, for nipper DG The transmission image with relatively low magnifying power is obtained, and the transmission image with relatively high magnifying power is obtained for rear tooth DE. Thus, in radiography unit by using multiple transmission images obtained as described above, complete to rebuild for arching trajectory DA It when scape image, needs to compensate or correct operation for magnifying power, for obtaining to corresponding portion using uniform magnifying power Image.
Meanwhile when obtaining the transmission image of corresponding portion of arcuate shape according to the x-ray imaging equipment of the present embodiment (tooth DE, eyetooth DF and nipper DG after such as), x-ray imaging equipment can obtain and store angle and the sense of rotary support member Survey the geological information of the position of small width sensor 311E, 311F and 311G in unit 31E, 31F and 31G, or storage energy The value that it is calculated.By using the above-mentioned geological information and coordinate information of arching trajectory, can obtain for each The Magnification values of transmission image, or the magnifying power relationship according to obtained transmission image position can be obtained.
Fig. 5 is showing the panoramic picture obtained according to the image layer of arching trajectory and by carrying out radiography to it Between ideal relationship schematic diagram.
Fig. 5 (a) is showing the perspective view of the image layer of the arching trajectory according to grid configuration, the center of bending such as arrow Part corresponds to front teeth, i.e. nipper DG, and both ends part and corresponds to molar, is rear tooth DE.Fig. 5 (b) shows reason Think that panoramic picture, the wherein image layer of Fig. 5 (a) are shown as plane surface.Herein, ideal panoramic picture means according to by each Partial difference of magnification is without the panoramic picture of distortion.In Fig. 5 (b), the magnifying power of nipper DG and rear tooth DE do not have difference.
In x-ray imaging equipment according to the present invention, in order to obtain by non-distorted complete for above-mentioned difference of magnification Scape image can use several method.As described above, first method is, it is each by using being obtained in radiography unit The geological information obtained when a transmission image carrys out the magnifying power of the target area of computed radiography main body, and by using multiple Transmission image (wherein reflecting magnifying power) rebuilds panoramic picture.It is being shifted along horizontal axis direction and is being overlapped multiple transmission plots When as rebuilding, in the shift intervals and arching trajectory between neighbouring transmission image the target area of radiography main body it Between actual range it is identical.
However, x-ray imaging equipment according to the present invention is not limited to above-mentioned panoramic picture method for reconstructing.First against such as Upper each described transmission image executes magnifying power amendment, and can be by reflecting radiography main body on arching trajectory Target area absolute position, when being reconstructed to panoramic picture by shifting and being overlapped, obtain non-distorted panoramic picture.Together When, need many times and many computing resources to be operated for image reconstruction.It is not scratched with offer to solve the above-mentioned problems Bent panoramic picture can use the another method for compensating or correcting magnifying power.This method will be described in more detail below.
Fig. 6 is distortion and its amendment side of the panoramic picture obtained by the arc form to Fig. 5 carries out radiography The schematic diagram of method.
Fig. 6 (a) is the distortion panorama sketch for schematically showing the radiography unit using x-ray imaging equipment and obtaining The view of the example of picture, wherein rotary support member rotate and small width sensor is moved along its width direction simultaneously, and do not apply The compensation or amendment of magnifying power.Described with reference to FIG. 4, the magnifying power of nipper DG is relatively low, and the magnifying power of rear tooth DE is opposite Greatly.Thus, when rebuilding compensation or amendment of the panoramic picture without executing magnifying power, the image layer quilt of Fig. 5 (a) as described above It is shown as distorting as shown in Fig. 6 (a), wherein opposite along the horizontal axis of nipper DG and the grid interval of y direction It is narrow and relatively wide along the horizontal axis of rear tooth DE and the grid interval of y direction.
Along horizontal axis rear tooth DE grid interval than actual grid interval distort bigger this scalloping It is related with the method for panoramic picture is rebuild.In general, by according to preset ray photograph Sequentially continuous by multiple radiographies When transmission image shifts and carries out overlapping and carry out radiography with predetermined rotary speed and pre-determined frame rate, it is assumed that for every One transmission image frame, it is right in the case that the shift intervals of the target area of radiography main body are distributed on arching trajectory Panoramic picture is rebuild.Above-mentioned method for reconstructing is suitable for providing weight by using relatively small computing resource and short time Build image.However, this method is along with the anamorphose as shown in Fig. 6 (a).
Fig. 6 (b) is the horizontal axis application schematically showed by along panoramic imagery sequence described in reference diagram 4 Magnifying power compensates and the view of the example of the panoramic picture of reconstruction.Herein, magnifying power is compensated it is meant that being along horizontal axis Compensation (i.e. during the multiple transmission images of acquisition) is executed for the radiography sequence distortion with reference to figure 6 (a) described in, according to The position of sensing unit, more specifically, according to distance between small width sensor and the target area of main body on arching trajectory Change, the rotary speed of rotary support member is changed, or the frame rate (frame rate) when obtaining multiple transmission image frames It is changed.
It is described with reference to figure 4, when carrying out radiography to nipper DG, because of arching trajectory and small width sensor The distance between 311G becomes close to, so magnifying power becomes relatively small, and the thus rotary support member in constant frame rate Rotary speed it is slack-off.Alternatively, in rotation speed constant, frame rate (that is, per second have multiple radiography frames) increases, from And obtain the transmission image of the arching trajectory of opposite fine.Distance between arching trajectory and small width sensor 311E becomes It is big with as rear tooth DE so that in the relatively large section of magnifying power, by the relative increase rotary speed in constant frame rate or By obtaining transmission image with respect to frame rate is reduced in rotation speed constant.In the multiple transmission image frame quilts as above obtained When shifting and be overlapped at a predetermined interval with reconstruction image, it can compensate because of the difference of magnification along horizontal axis described in Fig. 6 (a) Scalloping caused by different.As a result, in Fig. 6 (b), along horizontal axis, grid interval is constant.Meanwhile the control for passing through Fig. 3 Device 60 processed can execute the magnifying power compensation behaviour of the change of the rotary speed of the frame rate or rotary support member with sensing unit Make.
Fig. 6 (c) is to schematically show to execute regarding for the magnifying power correction result along y direction for panoramic picture Figure, wherein executing the magnifying power compensation along horizontal axis by the method for Fig. 6 (b).By calculating the magnifying power along y direction (magnifying power is different according to the position of arching trajectory upper edge horizontal axis), by using in execution ray as described above The geological information obtained when sequence of taking a picture, and the magnifying power by reflecting calculating in part corresponding with the image of Fig. 6 (b) The amendment of the magnifying power along y direction is corrected, to execute the magnifying power amendment along y direction.As a result, in Fig. 6 (c) In, it is corrected for along the grid interval of y direction identical in nipper DG and rear tooth DE.
Meanwhile as described above, x-ray imaging equipment according to the ... of the embodiment of the present invention includes sensing unit 31T, it is mounted To be tilted to the direction of the rotary shaft 25C of rotary support member as shown in Figure 1.Herein, described with reference to FIG. 2, due to upper Scalloping occurs for the difference between portion's magnifying power and lower part magnifying power, and the figure of tapered in form is shown in the image of Fig. 6 (c) As distortion.
Fig. 6 (d) is to schematically show that the scalloping due to tapered in form caused by the inclination of sensing unit is repaiied Positive result view.It is distributed, and can led to according to the magnifying power of sensing unit 31T height as shown in Fig. 2, being calculated by method of geometry It crosses and reflects calculated magnifying power distribution in panoramic picture corresponding with Fig. 6 (c) and correct the inclination due to sensing unit Caused by scalloping.
Herein, the amendment described with reference to figure 6 (c) and 6 (d) can by using multiple transmission images in reconstruction unit It is sequentially or concurrently executed when middle reconstruction panoramic picture.When executing two kinds of magnifying powers amendment as described above at the same time, with Fig. 6 (b) panoramic picture of corresponding intermediate steps is divided into multiple regions, can be directed to each region in advance and calculate along level The amendment constant of axis direction and the amendment constant along y direction, and can be provided and Fig. 6 by the calculated constant of application (d) corresponding to be corrected panoramic picture.
Fig. 7 a are showing the view without the example for correcting panoramic picture for not applying magnifying power compensation.Along trunnion axis and indulge Axis direction, nipper distort relatively small, and rear tooth distortion is relatively large.
Fig. 7 b are showing the example for the panoramic picture that the compensation of horizontal axis magnifying power is applied to radiography sequence View.It is corrected for closer to actual tooth width along tooth of the horizontal axis in nipper and rear tooth.
Fig. 7 c are the panoramas that the amendment of longitudinal axis magnifying power and tilt correction are applied to the radiography sequence of the image of Fig. 7 b The view of the example of image.Herein, it distorts along the magnifying power of y direction and according to image upper part and low portion Scalloping is corrected caused by difference of magnification.
Industrial feasibility
The present invention relates to x-ray imaging equipment, and can be used for medical X-ray images diagnostic device, more specifically, Ke Yiyong In dental X-ray diagnostic device field.

Claims (11)

1. a kind of x-ray imaging equipment, the equipment include：
Rotary support member is rotated based on rotary shaft；
Generate unit, be arranged the first side of rotary support member and include X-ray irradiation beam X-ray producer；
Sensing unit, is arranged the second side in rotary support member to face to generate unit, main body between, and sensing unit Including small width sensor, when rotary support member rotates the small width sensor along the small width sensor width direction simultaneously It is moved perpendicular to rotary shaft；With
Controller changes when executing the x-ray imaging sequence for obtaining multiple transmission images by rotary support member rotates by allowing The rotary speed of rotary support member or the frame rate of sensing unit.
2. equipment as described in claim 1, wherein being changed according to distance between small width sensor and the target area of main body Become, controller by change rotary support member rotary speed or sensing unit frame rate by the change of magnifying power is mended It repays.
3. the relative increase rotation support in the relatively large section of magnifying power of equipment as claimed in claim 2, wherein controller The rotary speed of part or the opposite frame rate for reducing sensing unit.
4. equipment as claimed in claim 3, wherein in the relatively large section of magnifying power, controller keeps rotary support member Rotation speed constant, and the opposite frame rate for reducing sensing unit.
5. equipment as claimed in claim 3, wherein in the relatively large section of magnifying power, controller keeps the frame of sensing unit Constant rate, and the rotary speed of relative increase rotary support member.
6. equipment as described in claim 1, wherein x-ray imaging sequence are panoramic imagery sequences, and the target area of main body Arcuately track is distributed.
7. equipment as claimed in claim 6, wherein compared with the section of the transmission image for obtaining nipper, for obtaining Afterwards in the section of the transmission image of tooth, the rotary speed of controller relative increase rotary support member or relatively reduction sensing unit Frame rate.
8. equipment as claimed in claim 6, further comprises image reconstruction unit, shifts and be overlapped multiple at a predetermined interval Transmission image, with the magnifying power difference according to the position compensation on arching trajectory along horizontal axis, and according on arching trajectory Along the position of horizontal axis, the magnifying power along y direction is corrected by application ratio different from each other.
9. a kind of x-ray imaging equipment, the equipment include：
Rotary support member is rotated based on rotary shaft；
Generate unit, be arranged the first side of rotary support member and include X-ray irradiation beam X-ray producer；
Sensing unit, is arranged the second side in rotary support member to face to generate unit, main body between, and sensing unit Including small width sensor, when rotary support member rotates the small width sensor along the small width sensor width direction simultaneously Perpendicular to rotary shaft movement；With
Controller, when executing the x-ray imaging sequence for obtaining multiple transmission images by rotary support member rotates by allowing, according to The change of distance between the target area of main body and small width sensor changes the rotary speed or sensing unit of rotary support member Frame rate, to compensate the change of magnifying power, wherein
X-ray producer is installed so that the direction of X-ray beam has the pre-determined tilt relative to the surface vertical with rotary shaft Degree, and small width sensor is installed as tilting at a predetermined angle relative to the surface parallel with rotary shaft.
10. equipment as claimed in claim 9, wherein x-ray imaging sequence are panoramic imagery sequences, and the target area of main body Arcuately track is distributed, and equipment further comprises image reconstruction unit, by allowing multiple transmission images to move at a predetermined interval Position is simultaneously overlapped, and according to the position on arching trajectory, compensates the magnifying power difference along horizontal axis, and according on arching trajectory Along the position of horizontal axis, the magnifying power along y direction is corrected by application ratio different from each other.
11. equipment as claimed in claim 10, wherein image reconstruction unit amendment are caused due to the inclination of small width sensor Top magnifying power and lower part magnifying power difference.
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